Over here we have a basic/mandatory insurance (fixed price & coverage, no matter which insurance company you choose). Roughly 90% of the treatments are covered.
We have universal healthcare in Canada, which is great. Taxes are higher here than the US, but at least we get treated. The down-side is, a lot of people take advantage of the system who have no business being in the ER. My brother broke his arm in half when some fat kid jumped him in grade 2. My parents and him waited 6 hours for a doctor! But he DID get treated eventually, and we paid nothing out of pocket.
I understand the problem, at least pre-obamacare, in the US, is that people were rejected from insurance companies because of pre-existing conditions. Or their premiums were unrealistically high. I'm not sure what the situation is like over there now, but I'm guessing its not so great still as lots of people are still complaining.